diff --git a/library/think/model/relation/MorphOne.php b/library/think/model/relation/MorphOne.php
index b1e4c3d1..9e231d68 100644
--- a/library/think/model/relation/MorphOne.php
+++ b/library/think/model/relation/MorphOne.php
@@ -150,7 +150,7 @@ class MorphOne extends Relation
 
             if (isset($data[$pk])) {
                 $relationModel = $data[$pk];
-                $data[$pk]->setParent(clone $result);
+                $relationModel->setParent(clone $result);
                 $relationModel->isUpdate(true);
             } else {
                 $relationModel = null;